Tool for assisting high-temperature treatment test of silicon carbide fiber bundle

Abstract

The utility model discloses a tool for assisting a high-temperature treatment test of a silicon carbide fiber bundle, which comprises two opposite and vertically arranged graphite frames, and a first graphite guide roller and a second graphite guide roller are arranged between one ends of the graphite frames. A third graphite guide roller and a fourth graphite guide roller are arranged between the other ends of the graphite frames, and a fifth graphite guide roller and a sixth graphite guide roller are further arranged between the first graphite guide roller and the third graphite guide roller; silicon carbide fibers are wound on the first graphite guide roller, the fifth graphite guide roller, the sixth graphite guide roller, the third graphite guide roller, the fourth graphite guide roller and the second graphite guide roller in a looping manner. According to the tool for assisting the high-temperature treatment test of the silicon carbide fiber bundle, the silicon carbide fiber bundle meeting the tensile property test requirement can be manufactured.

Description

Technical Field

[0001] The utility model relates to the technical field of fiber performance testing, in particular to a tool used for assisting a high-temperature treatment test of silicon carbide fiber bundles. Background Art

[0002] Silicon carbide fiber (SiCF)-reinforced ceramic matrix composites (CMCs) exhibit excellent high-temperature mechanical properties, making them widely used in high-temperature structural components such as rocket tubes, missile nose cones, wing leading edges, and brake pads. As a novel semiconductor material, SiCF, with its excellent physical, chemical, and electrical properties, has become a crucial semiconductor material for the manufacture of short-wavelength optoelectronic devices, high-temperature devices, radiation-resistant devices, and high-power, high-frequency electronic devices. SiCF materials have enormous potential for application in high-temperature, high-frequency, high-power, and high-voltage optoelectronics, as well as in radiation resistance. However, the strength of silicon carbide fibers directly affects the strength of fiber-reinforced composites, making it particularly important to test the tensile strength of fiber bundles after high-temperature treatment.

[0003] Existing testing methods primarily focus on testing the tensile strength of single silicon carbide fibers after high-temperature treatment. According to Method 7.1 of the national standard GB / T34520.7-2017, "Test Methods for Continuous Silicon Carbide Fibers - Part 7: High-Temperature Strength Retention," the high-temperature bundled fiber samples are evenly arranged on a graphite or ceramic boat and then smoothly transferred into the constant temperature zone of the high-temperature treatment equipment for treatment. The fiber's condition after high-temperature treatment directly impacts the subsequent sizing and tensile testing. Since the fiber surface is free of sizing agent after high-temperature treatment, it is either loose or sticky. Direct sizing can lead to fiber breakage, primarily due to the creep properties of the fiber and the orderly winding of the fiber product around the paper tube after high-temperature treatment, resulting in inaccurate test results. Furthermore, since the fiber may exhibit a certain degree of curvature after high-temperature treatment, testing directly on a graphite or ceramic boat can result in inaccurate results due to the effects of shear forces, making the test results inaccurate.

[0004] Therefore, in order to solve the above problems, it is necessary to improve the existing high-temperature treatment device for silicon carbide fiber bundles to more accurately reflect the true tensile strength of the silicon carbide fibers after high-temperature treatment. Utility Model Content

[0005] The purpose of the utility model is to provide a tool for assisting high-temperature treatment tests of silicon carbide fiber bundles, which can produce silicon carbide fiber bundles that meet the requirements of tensile performance tests.

[0006] In order to achieve the above objectives, the solution of the present invention is:

[0007] A tool for assisting in a high-temperature treatment test of silicon carbide fiber bundles includes two opposing and vertically arranged graphite frames, with a first graphite guide roller and a second graphite guide roller disposed between one end of the graphite frames, the first and second graphite guide rollers being arranged vertically, and a third graphite guide roller and a fourth graphite guide roller disposed between the other ends of the graphite frames, the third and fourth graphite guide rollers being arranged vertically, and a fifth and sixth graphite guide rollers disposed between the first and third graphite guide rollers. Silicon carbide fibers are wound in loops around the first, fifth, sixth, third, fourth, and second graphite guide rollers, with graphite blocks disposed between the first and fifth graphite guide rollers at positions corresponding to respective loops of silicon carbide fibers, and graphite blocks disposed between the third and sixth graphite guide rollers at positions corresponding to respective loops of silicon carbide fibers.

[0008] The first graphite guide roller and the second graphite guide roller are vertically arranged up and down.

[0009] The third graphite guide roller and the fourth graphite guide roller are vertically arranged up and down.

[0010] The first graphite guide roller, the third graphite guide roller, the fifth graphite guide roller and the sixth graphite guide roller are located on the same horizontal plane.

[0011] The second graphite guide roller and the fourth graphite guide roller are located on the same horizontal plane.

[0012] The lower end of each graphite pressing block is provided with a groove for the corresponding silicon carbide fiber to extend into.

[0013] The graphite pressing blocks located at the same end of the graphite frame are connected together.

[0014] The thickness of each graphite frame is 8-10 mm.

[0015] After adopting the above structure, the utility model is a tool for assisting the high-temperature treatment test of silicon carbide fiber bundles. It mainly considers two technical difficulties. The first is the selection of high-temperature materials. Since it involves a high-temperature environment, it is necessary to select a material that can withstand high temperatures to make the tooling. Graphite is a material with excellent high-temperature resistance. It performs well in an inert atmosphere and is the best choice. In addition, graphite also has good thermal conductivity and electrical conductivity, which enables it to effectively transfer heat and current in a high-temperature environment. Another key technical difficulty is the application of tension to the silicon carbide fiber. During the experiment, it is necessary to apply appropriate tension to the fiber to keep the fiber straight after high-temperature treatment. By continuously winding silicon carbide fibers around the first, fifth, sixth, third, fourth, and second graphite guide rollers, the sample preparation process is simplified, resulting in a tighter, more uniform fiber winding process and less prone to breakage. Graphite blocks are pressed against both ends of the silicon carbide fibers to apply a preload to the fiber midsection between the fifth and sixth graphite guide rollers. This increased preload maintains a stable tension state and a straight line during high-temperature treatment, effectively reducing transverse forces during testing and accurately measuring the fiber's true mechanical properties. This fixture also facilitates the bundling and sizing process during fiber mechanical testing. Using this fixture prevents fibers without sizing from becoming loose after cutting the midsection, which can affect sample preparation. It also ensures that the fibers are not damaged during the bundling and sizing process, ensuring uniform sizing, ensuring that the fiber's tensile strength is accurately reflected in the post-high-temperature test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of a tool for assisting high-temperature treatment test of silicon carbide fiber bundles.

[0017] In the picture:

[0018] Graphite rack 1; first graphite guide roller 2;

[0019] Second graphite guide roller 3; Third graphite guide roller 4;

[0020] Fourth graphite guide roller 5; Fifth graphite guide roller 6;

[0021] Sixth graphite guide roller 7; graphite block 8;

[0022] Groove 81. DETAILED DESCRIPTION

[0023] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0024] A tool for assisting high temperature treatment test of silicon carbide fiber bundles, such as Figure 1 As shown, it includes two graphite frames 1 arranged opposite to each other and vertically. During production, it is necessary to consider the selection of materials and thickness design to avoid damage to the fiber caused by deformation of the tooling. Therefore, the thickness of each graphite frame 1 is preferably 8-10 mm.

[0025] A first graphite guide roller 2 and a second graphite guide roller 3 are disposed between one end of the graphite frame 1, and are arranged vertically above and below. A third graphite guide roller 4 and a fourth graphite guide roller 5 are disposed between the other ends of the graphite frame 1, and are arranged vertically above and below. The second graphite guide roller 3 and the fourth graphite guide roller 5 are located on the same horizontal plane. Specifically, one end of the first graphite guide roller 2 is inserted into the inner sidewall of one of the graphite frames 1, and the other end of the first graphite guide roller 2 is inserted into the inner sidewall of the other graphite frame 1. The second, third, 4, and fourth graphite guide rollers 3, 4, and 5 are fixed in the same manner as the first graphite guide roller 2 and will not be further described here.

[0026] A fifth and sixth graphite guide rollers 6 and 7 are positioned between the first and third graphite guide rollers 2 and 4, respectively, and are positioned within the graphite frame 1. The first, third, fifth, and sixth graphite guide rollers 2, 4, 6, and 7 are positioned on the same horizontal plane. The fifth and sixth graphite guide rollers 6 and 7 are positioned symmetrically. The fixing method for the fifth and sixth graphite guide rollers 6 and 7 is the same as that for the first graphite guide roller 2 and will not be further described here.

[0027] The starting end of the silicon carbide fiber is tied to the first graphite guide roller 2, and then the silicon carbide fiber is wound into a circle around the first graphite guide roller 2, the fifth graphite guide roller 6, the sixth graphite guide roller 7, the third graphite guide roller 4, the fourth graphite guide roller 5 and the second graphite guide roller 3, with an interval of about 5 mm between each circle of silicon carbide fiber, until the first graphite guide roller 2, the fifth graphite guide roller 6, the sixth graphite guide roller 7, the third graphite guide roller 4, the fourth graphite guide roller 5 and the second graphite guide roller 3 are fully wound.

[0028] Graphite blocks 8 are placed between the first and fifth graphite guide rollers 2 and 6, corresponding to the positions of each silicon carbide fiber coil. Graphite blocks 8 are also placed between the third and sixth graphite guide rollers 4 and 7, corresponding to the positions of each silicon carbide fiber coil. Each graphite block 8 is neatly arranged, and a groove 81 is defined at the lower end of each block for the corresponding silicon carbide fiber to extend into. The weight of each block 8 increases the tension in the middle section of the silicon carbide fiber between the fifth and sixth graphite guide rollers 6 and 7. Preferably, the graphite blocks 8 at the same end of the graphite frame 1 are connected in series via a rope. The weight of each block 8 is approximately 1% to 4% of the room temperature force of each silicon carbide fiber coil.

[0029] After adopting the above structure, the utility model is a tool for assisting the high-temperature treatment test of silicon carbide fiber bundles. When in use, the tool wrapped with silicon carbide fibers is directly placed in a high-temperature furnace for high-temperature treatment. It is also convenient for the bundle gluing and bundling process during fiber mechanical testing, and can produce silicon carbide fiber bundles that meet the requirements of tensile performance testing.

[0030] In order to prove the actual effect of the tooling, silicon carbide fiber bundles produced in the same batch were taken and subjected to high-temperature treatment tests together with the traditional method (laying the silicon carbide fibers directly on a graphite boat or a ceramic boat) and the tooling of the utility model wrapped with silicon carbide fibers. The experimental conditions were 1500°C in an inert atmosphere of argon, holding for 24 h, and a heating rate of 3°C / min. Then, the treated silicon carbide fibers were sampled and dried according to the requirements of method 7.1 of GB / T 34520.4-2017 "Test methods for continuous silicon carbide fibers - Part 4 - Tensile properties of bundles" and the tensile properties were tested using a tensile testing machine.

[0031] The results show that after high-temperature treatment using the tooling of the present invention, the high-temperature retention rate of the silicon carbide fiber is 58.0% and the dispersion is 10%, while the high-temperature retention rate of the silicon carbide fiber using the traditional method is 33.8% and the dispersion is 21%. It can be seen that the test effect of this tooling is better.

[0032] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A tool for assisting in high-temperature treatment testing of silicon carbide fiber bundles, characterized by: The invention comprises two graphite frames arranged opposite to each other and vertically, wherein a first graphite guide roller and a second graphite guide roller are arranged between one end of the graphite frames, and the first graphite guide roller and the second graphite guide roller are arranged vertically, and a third graphite guide roller and a fourth graphite guide roller are arranged between the other end of the graphite frames, and the third graphite guide roller and the fourth graphite guide roller are arranged vertically, and a fifth graphite guide roller and a sixth graphite guide roller are further arranged between the first graphite guide roller and the third graphite guide roller, and the silicon carbide fiber is wound in a loop around the first graphite guide roller, the fifth graphite guide roller, the sixth graphite guide roller, the third graphite guide roller, the fourth graphite guide roller and the second graphite guide roller, and a graphite block is respectively arranged at a position corresponding to each loop of silicon carbide fiber between the first graphite guide roller and the fifth graphite guide roller, and a graphite block is also respectively arranged at a position corresponding to each loop of silicon carbide fiber between the third graphite guide roller and the sixth graphite guide roller.

2. The tooling for assisting high-temperature treatment testing of silicon carbide fiber bundles according to claim 1, characterized in that: The first graphite guide roller and the second graphite guide roller are vertically arranged up and down.

3. The tooling for assisting high-temperature treatment testing of silicon carbide fiber bundles according to claim 1, characterized in that: The third graphite guide roller and the fourth graphite guide roller are vertically arranged up and down.

4. The tooling for assisting high-temperature treatment testing of silicon carbide fiber bundles according to claim 1, characterized in that: The first graphite guide roller, the third graphite guide roller, the fifth graphite guide roller and the sixth graphite guide roller are located on the same horizontal plane.

5. The tooling for assisting high-temperature treatment testing of silicon carbide fiber bundles according to claim 1, characterized in that: The second graphite guide roller and the fourth graphite guide roller are located on the same horizontal plane.

6. The tooling for assisting high-temperature treatment testing of silicon carbide fiber bundles according to claim 1, characterized in that: The lower end of each graphite pressing block is provided with a groove for the corresponding silicon carbide fiber to extend into.

7. The tooling for assisting high-temperature treatment testing of silicon carbide fiber bundles according to claim 1, characterized in that: The graphite pressing blocks located at the same end of the graphite frame are connected together.

8. The tooling for assisting high-temperature treatment testing of silicon carbide fiber bundles according to claim 1, characterized in that: The thickness of each graphite frame is 8-10 mm.

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